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Jly 16 1929- ,.1. DRAHoNovsKY 1.721,008

TIMER FOR INTERNAL COHBUSTION ENGINESl Filed June 22,. 1925 INVENTOIL 7 Da/mnovs/Cy A TTORNEYJ'.

Patented July 16, 1929.

Unirse STATES JALIES DRAHONOVSKY, OF `MILWAUKEE, WISCONSIN.

TIMER FOR INTERNAL-COMBUSTION ENGINES.

Application led .Tune 22,

My invention relates to -a ,Simplification of the construction of the timers for internal combustion engines disclosed in my prior applications, Serial No, 635,668,- led April 30, v1923, and Serial No. 640,862, tiled May 23, 1923, and is designed for accomplishing the same purposes. f Y

The present invention resides in a timerof exceedingly simple and economical construction, the. details of which willl now be set forth` and the novelty thereofpointed out in the appendedclaims. y l

. In the accompanying drawing:

Y, Figure 1 is a longitudinal sectio'nalfview taken on the line 1 1, Figure 2, showingthe construct-ign oil my simplified timer.

Fig. 2 is a front'elevation, looking from the lett of Figure 1, some of the parts being broken out in the interest, iofclearn'ess.

The numeral. indicates-' the frame in which is journalcd the timer shaft 11, upon the reduced forward end -of which the sleeve 12 of the brush is mounted, such sleeve being held so as to rotate with the shaft by means of a pin which passes through the sleeve and enters a hole in the said shaft. A ferrule 18 covers the head ot the pin and is held in position upon the shaft by means of a nut 14, threaded upon the end of the shaft, all as usual in my prior constructions.

The casing 15 for the timer may be formed as a stamping, it being provided with an enlarged central portion 16 forming a cavity in which the end of the shaft 11 is received. A ring 17, provided with a circumferential interior shoulder 18, rests in the annular scat 19 formed on the frame 10. The cylindrical web 20 of the casing 15 is adapted to be nested wit-hin the ring 17 and rest upon the circumferential flange 18, the parts being held in the positions described by spring pressure of the. finger 21.

The commutator used in the present in vention is of novel form, it being comprised of an annular body 22 which may be approximately square in cross section. A suitable 4number of projections 23 form integrally with the commutator 22 extend at one side thereof, and are arranged in corresponding openings in the bottom of the casing 15. The annular commutator rests upon the circumferential. shoulder 18 of the ring 17 and the project-ions 23 may be formed with shoulders 24 to bear against the material of the easing in the vicinity of the holes therein1 so as to retain the commutator in an ap- 1923. serial No. 646,995.

proximatel'y` vfixe-.d lposition witl 1in ,the casing at all times, The shoulders24 on the lateral' projections 23 of the commutator form distance pieces which cause the commutator to lretain its seat upon the ring 18, but it is obvious that other .means between the casing and theco-mmutator ring may be emplol ed lfor the saine `purpose. W'hile the said' sioulders 24 are shown, it is apparent that they are not'essential to the practice of my inv-'elutionv In formingwthehannulus ,23 the commutator @the @and 'the'- connected binding; postls26 ,are ,secured Vin the mould,

the post'sz26 positioned so as to have a central location with respect `to the projectegral part of the 'commutator ring 22.

From theconstnuctiondescribed ,it will be seen .that the electrical ,connections are thoroughly insulated andthat contact can be madeonlyUvvith'tli'e faces of the plugs 25 of the casing.

The sleeve 12 mounted upon the timer shaft is provided with a tubular arm 27, in which is mounted for radial movement a brush 28, actuated outwardly into contact with the plugs by means of an expansion spring 29 confined between the sleeve and the brush. The tubular arm 27 is slotted, as at 30, so as to permit movement of a pin 31 attached to the brush 28, the pin serving to retain the brush within the sleeve 27. The spring 28 acts to hold the brush in contact with the plugs during the rotation of the brush, the pressure thereof being suilicient to cause a good contactto be made between the part-s. I have shown the brush 28 as formed as a shell in the hollow of which the spring 29 is received, the shell being rounded at its outer and closed end for easy movement over the inner surface of the commutator.

The casing 15 is provided with a projection 32, to which a. connection 33 is attached, so that the casing may be given a slight movement of rotation in advancing or retarding the spark.

The construction set forth is simple and very economical in manufacture. Its simplicity adds greatly to the ease with which the parts may be assembled.

t-ions 23 as thelatter-j are formed as aninllO Having thus described my invention, what I claim and' desire to secure by Letters Patent of the United States, is:

l. A timer for internal combustion engines comprising a rotating shaft and a radially movable brush thereon, a casing provided with openings paralleling the shaft, and a commutator ring located Within the casing and provided interiorly with contact-s for the brush lateral projections extending through the said openings to support the ring.

2. A timer for internal combustion engines comprising a Arotating shaft, a tubular sleeve mounted upon the said shaft and carrying a tubular arm extending radially of the shaft, a spring pressed brush mounted in the said tubular arm for radial movement with respect to the shaft, a casing provided with axially parallel openings, and a commutator ring having plugs exposed upon its inner surface and having lateral extensions disposed in the openings, by which it is supported in the path 'of movement of the` radially movabletbrush', to effect Contact in the rotative movement vof the brush with the shaft.

3. A timer for internal combustion engines comprising a frame, a rotating shaft journaled therein, an internally flanged ring seated upon the frame, a commutator ring,

Contact plugs 'exposed upon its inner face resting upon the flange, a brush carried by the shaft and adapted to contact with the plugs of the ring, and a casing provided with openings paralleling the said shaft covering the eommutator, the said commutator ring being provided with integrally formed lateral extensions passing through said openings in the casing.

4. As an article of manufacture, a commutator ring for internal combustion engines having contact plugs imbedded therein and exposed interiorly for radial contact, and provided with lateral extensions in which are embedded binding posts connected to the said plugs, the said lateral extensions forming supports for the said ring.

5. A timer for internal combustion engines comprising a ring provided with an internal flange, a commutator ring resting upon the said flange and provided with integral lateral extensions, a casing nested in the said ring and provided with openings for the reception of the said lateral exten sions, and means between the/said casing and the commutator ring for holding the ring in position upon the said internal flange.

In testimony whereof, I have signed my name at Milwaukee, this 16th day of J une,

JAMES DRAHONOVSKY. 

